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2C-B-FLY is 8-bromo-2,3,6,7-benzo-dihydro-difuran-ethylamine. The full name of the chemical is 2-(8-bromo-2,3,6,7-tetrahydrofuro[2,3-f][1]benzofuran-4-yl)ethanamine.

In theory, dihydrodifuran analogues of any of the 2Cx / DOx family of drugs could be made, and would be expected to show similar activity to the parent compound. So in the same way that 2C-B-FLY is the dihydrodifuran analogue of 2C-B, the 8-iodo equivalent 2C-I-FLY would be the dihydrodifuran analogue of 2C-I, and the 8-methyl equivalent 2C-M-FLY would be the dihydrodifuran analogue of 2C-D.

Other related compounds can also be produced, where the alpha carbon of the ethylamine chain is methylated, the amphetamine derivative 3C-B-FLY would be made, this compound being the dihydrodifuran analogue of DOB, and would also be the unsaturated equivalent of Bromo-DragonFLY.

Where only one methoxy group of a 2Cx drug is cyclised into a dihydrofuran ring, the resulting compound is known as a "hemifly", and when an unsaturated furan ring is used the compound is known as a "hemi-dragonfly". A large family of compounds can thus be derived, many of which can be predicted to be active hallucinogens based on the known structure-activity relationships of these drugs, although most of these compounds have not yet been made and tested.

2C-B-FLY is unscheduled and uncontrolled in the United States, but possession and sales of 2C-B-FLY could probably be prosecuted under the Federal Analog Act because of its structural similarities to 2C-B.